This document specifies platform changes and deprecations to support user migration to newer APIs annd software toolkits.

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Pytket Extensions

The following Pytket extensions are classified for continued maintenance or sunset. Sunset means Quantinuum will no longer provide maintenance or support; repositories will be archived but remain publicly available as community‑maintained packages.

Continued Maintenance

Quantinuum commits to maintaining and supporting usage of the specified packages:

• pytket‑quantinuum
• pytket‑pecos
• pytket‑phir
• pytket‑qir
• pytket‑braket
• pytket‑qiskit
• pytket‑qulacs
• pytket‑cutensornet
• pytket‑aqt
• pytket‑iqm

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Flagged for Immediate Sunset

Quantinuum intends to begin sunset of the specified packages effective immediate. No further maintenance or support will be provided. The GitHub repo for these packages will continue to exist in an archived state at https://github.com/Quantinuum/.

The packages marked for sunset are:

• pytket‑qujax
• pytket‑azure
• pytket‑projectq
• pytket‑dqc
• pytket‑cirq
• pytket‑pennylane
• pytket‑pyquil
• pytket‑pysimplex
• pytket‑pyzx
• pytket‑stim

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Nexus

Legacy API Sunset

Legacy API endpoints currently served at:

https://qapi.quantinuum.com/v1

will be replaced by Nexus endpoints at:

https://nexus.quantinuum.com

User roles (User, Org Admin) remain unchanged. For more information, please see Nexus REST API reference.

Endpoint Mapping Summary

Function	Legacy Endpoint	Nexus Endpoint
Authentication	/login	/auth/login/
Machine Status	/machine/*	/api/machines/v1beta/
Calendar	/reservation/*	/api/events/v1beta
Users	/users/*	/api/users/v1beta*, v1beta2
Groups	/organizations/{org}/user-group/*	/api/groups/v1beta/*
Quotas	/users/.../quota	/api/qsys_quotas/v1beta/*
Orgs	/organizations/{org}	/api/orgs/v1beta2/{org}
Jobs	/job/*	/api/jobs/v1beta3/*

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Fuzzy Name Searching

All new APIs distinguish between fuzzy and exact matching using:

• name_exact
• name_fuzzy

Examples include:

• /api/circuits/v1beta2
• /api/compilations/v1beta3
• /api/jobs/v1beta3

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UUID‑Based Resource Queries

The following Nexus endpoints use UUIDs instead of names:

• /api/orgs/v1beta2/{organization_id}/users
• /api/groups/v1beta/{group_id}
• /api/groups/v1beta/{group_id} (PATCH / DELETE)

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Support

For more information or questions on changes to Quantinuum's compute platform, please contact support@quantinuum.com.